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/*

 * Project: S.Ha.R.K.

 *

 * Coordinators:

 *   Giorgio Buttazzo    <giorgio@sssup.it>

 *   Paolo Gai           <pj@gandalf.sssup.it>

 *

 * Authors     :

 *   Paolo Gai           <pj@gandalf.sssup.it>

 *   (see the web pages for full authors list)

 *

 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)

 *

 * http://www.sssup.it

 * http://retis.sssup.it

 * http://shark.sssup.it

 */

/*

 * Copyright (C) 2001 Paolo Gai

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 */

#include "edfstar.h"

#include <ll/stdio.h>

#include <ll/string.h>

#include <kernel/model.h>

#include <kernel/descr.h>

#include <kernel/var.h>

#include <kernel/func.h>

#include <tracer.h>

#define EDFSTAR_CHANGE_LEVEL 1

/* for iqueues */

/* #include "iqueue.h" Now iqueues are the only queue type available

   into the kernel */

#include <kernel/iqueue.h>

/* for BUDGET_TASK_MODEL */

#include "fsf_contract.h"

#include "fsf_server.h"

/*

 * DEBUG stuffs begin

 */

//#define EDFSTAR_DEBUG

#ifdef EDFSTAR_DEBUG

static __inline__ fake_printf(char *fmt, ...) {}

//#define edfstar_printf fake_printf

//#define edfstar_printf2 fake_printf

//#define edfstar_printf3 fake_printf

#define edfstar_printf kern_printf

#define edfstar_printf2 kern_printf

#define edfstar_printf3 kern_printf

#endif

/*

 * DEBUG stuffs end

 */

/* Status used in the level */

#define EDFSTAR_READY         MODULE_STATUS_BASE    /* - Ready status        */

#define EDFSTAR_IDLE          MODULE_STATUS_BASE+4  /* to wait the deadline  */

/* flags */

#define EDFSTAR_FLAG_NOPREEMPT   4 

#define EDFSTAR_FLAG_NORAISEEXC  2

#define EDFSTAR_FLAG_SPORADIC    1

/* the level redefinition for the Earliest Deadline First level */

typedef struct {

  level_des l;     /* the standard level descriptor          */

  TIME period[MAX_PROC]; /* The task periods; the deadlines are

                       stored in the priority field           */

  int deadline_timer[MAX_PROC];

                   /* The task deadline timers               */

  struct timespec deadline_timespec[MAX_PROC];

  int dline_miss[MAX_PROC]; /* Deadline miss counter */

  int wcet_miss[MAX_PROC];  /* Wcet miss counter */

  int nact[MAX_PROC];       /* Wcet miss counter */

  int flag[MAX_PROC];

                   /* used to manage the JOB_TASK_MODEL and the

                       periodicity                            */

  IQUEUE ready;     /* the ready queue                        */

  PID activated;   /* the task that has been inserted into the

                       master module */

  int budget[MAX_PROC];

  int scheduling_level;

  int cap_lev;

  struct timespec cap_lasttime;

} EDFSTAR_level_des;

static void capacity_handler(void *l)

{

  EDFSTAR_level_des *lev = l;

  lev->cap_lev = NIL;

  event_need_reschedule();

}

static void EDFSTAR_check_preemption(EDFSTAR_level_des *lev)

{

  PID first;

  #ifdef EDFSTAR_DEBUG

    edfstar_printf("(E:chk)");

  #endif

  /* check if the task is preempteble or not */

  if (lev->flag[lev->activated] & EDFSTAR_FLAG_NOPREEMPT) return;

  if ((first = iq_query_first(&lev->ready)) != lev->activated) {

    if (lev->activated != NIL)

      level_table[ lev->scheduling_level ]->

        private_extract(lev->scheduling_level, lev->activated);

    lev->activated = first;

    if (first != NIL) {

      BUDGET_TASK_MODEL b;

      budget_task_default_model(b, lev->budget[first]);

      level_table[ lev->scheduling_level ]->

        private_insert(lev->scheduling_level, first, (TASK_MODEL *)&b);

    }

  }

}

static void EDFSTAR_timer_deadline(void *par);

static void EDFSTAR_internal_activate(EDFSTAR_level_des *lev, PID p,

                                      struct timespec *t)

{

  #ifdef EDFSTAR_DEBUG

    edfstar_printf("(E:iact)");

  #endif

  ADDUSEC2TIMESPEC(lev->period[p], t);

  *iq_query_timespec(p, &lev->ready) = *t;

  lev->deadline_timespec[p] = *t;

  /* Insert task in the correct position */

  proc_table[p].status = EDFSTAR_READY;

  iq_timespec_insert(p,&lev->ready);

  proc_table[p].control &= ~CONTROL_CAP;

  /* check for preemption */

  EDFSTAR_check_preemption(lev);

}

static void EDFSTAR_timer_deadline(void *par)

{

  PID p = (PID) par;

  EDFSTAR_level_des *lev;

  lev = (EDFSTAR_level_des *)level_table[proc_table[p].task_level];

  lev->deadline_timer[p] = NIL;  

  switch (proc_table[p].status) {

    case EDFSTAR_IDLE:

      /* set the request time */

      if (!(lev->flag[p] & EDFSTAR_FLAG_SPORADIC))

        EDFSTAR_internal_activate(lev,p,iq_query_timespec(p, &lev->ready));

      event_need_reschedule();

      break;

    default:

      #ifdef EDFSTAR_DEBUG

        kern_printf("(E:Dl:%d)",p);

      #endif

      /* else, a deadline miss occurred!!! */

      lev->dline_miss[p]++;

      TRACER_LOGEVENT(FTrace_EVT_task_deadline_miss,proc_table[p].context,proc_table[p].task_level);

      /* the task is into another state */

      if (!(lev->flag[p] & EDFSTAR_FLAG_SPORADIC)) {

        lev->nact[p]++;

        ADDUSEC2TIMESPEC(lev->period[p], &lev->deadline_timespec[p]);

      }

  }

  /* Set the deadline timer */

  if (!(lev->flag[p] & EDFSTAR_FLAG_SPORADIC))

    lev->deadline_timer[p] = kern_event_post(&lev->deadline_timespec[p],

                                             EDFSTAR_timer_deadline,

                                             (void *)p);

}

static void EDFSTAR_timer_guest_deadline(void *par)

{

  PID p = (PID) par;

  #ifdef EDFSTAR_DEBUG

    edfstar_printf("(E:gdl)");

  #endif

  kern_raise(XDEADLINE_MISS,p);

}

static int EDFSTAR_public_create(LEVEL l, PID p, TASK_MODEL *m)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  /* if the EDFSTAR_task_create is called, then the pclass must be a

     valid pclass. */

  HARD_TASK_MODEL *h;

  if (m->pclass != HARD_PCLASS) return -1;

  if (m->level != 0 && m->level != l) return -1;

  h = (HARD_TASK_MODEL *)m;

  if (!h->wcet || !h->mit) return -1;

  /* now we know that m is a valid model */

  #ifdef EDFSTAR_DEBUG

    edfstar_printf("(E:Crt)");

  #endif

  lev->period[p] = h->mit;

  lev->flag[p] = 0;

  if (h->periodicity == APERIODIC)

       lev->flag[p] |= EDFSTAR_FLAG_SPORADIC;

  lev->deadline_timer[p] = -1;

  lev->dline_miss[p]     = 0;

  lev->wcet_miss[p]      = 0;

  lev->nact[p]           = 0;

  /* Enable wcet check */

  proc_table[p].avail_time = h->wcet;

  proc_table[p].wcet       = h->wcet;

  return 0; /* OK, also if the task cannot be guaranteed... */

}

static void EDFSTAR_account_capacity(EDFSTAR_level_des *lev, PID p)

{

  struct timespec ty;

  TIME tx;

  SUBTIMESPEC(&schedule_time, &lev->cap_lasttime, &ty);

  tx = TIMESPEC2USEC(&ty);

  proc_table[p].avail_time -= tx;

}

static int EDFSTAR_public_eligible(LEVEL l, PID p)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  #ifdef EDFSTAR_DEBUG

    edfstar_printf2("(E:eli)");

  #endif

  return level_table[ lev->scheduling_level ]->

    private_eligible(lev->scheduling_level,p);

}

static void EDFSTAR_public_dispatch(LEVEL l, PID p, int nostop)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  struct timespec ty;

  #ifdef EDFSTAR_DEBUG

    edfstar_printf("(E:dis)");

  #endif

  if (!nostop || proc_table[exec].task_level==l) {

      TIMESPEC_ASSIGN(&ty, &schedule_time);

      TIMESPEC_ASSIGN(&lev->cap_lasttime, &schedule_time);

      /* ...and finally, we have to post a capacity event on exec task because the shadow_task consume

       *      *        capacity on exe task always */

      if (proc_table[exec].avail_time > 0) {

        ADDUSEC2TIMESPEC(proc_table[exec].avail_time ,&ty);

        lev->cap_lev = kern_event_post(&ty,capacity_handler, lev);

      }

      level_table[lev->scheduling_level]->private_dispatch(lev->scheduling_level, p, nostop);

  }

  else

      level_table[proc_table[exec].task_level]->public_dispatch(proc_table[exec].task_level, p, nostop);

}

static void EDFSTAR_public_epilogue(LEVEL l, PID p)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  #ifdef EDFSTAR_DEBUG

    edfstar_printf("(E:epi ");

  #endif

  if (lev->cap_lev!=NIL) {

       kern_event_delete(lev->cap_lev);

       lev->cap_lev=NIL;

  }

  if ( proc_table[exec].task_level==l ) {

     if (proc_table[exec].avail_time > 0) EDFSTAR_account_capacity(lev,exec);

     /* check if the wcet is finished... */

     if (proc_table[exec].avail_time < 0) {

        /* wcet finished: disable wcet event and count wcet miss */

       #ifdef EDFSTAR_DEBUG

         edfstar_printf2("W%d",p);

       #endif

        //proc_table[p].control &= ~CONTROL_CAP;

        lev->wcet_miss[exec]++;

        proc_table[exec].avail_time = 0;

        TRACER_LOGEVENT(FTrace_EVT_task_wcet_violation,proc_table[exec].context,proc_table[exec].task_level);

     }

     #ifdef EDFSTAR_DEBUG

       edfstar_printf(")");

     #endif

     level_table[ lev->scheduling_level ]->

       private_epilogue(lev->scheduling_level,p);

     proc_table[exec].status = EDFSTAR_READY;

    } else

        level_table[proc_table[exec].task_level]->public_epilogue(proc_table[exec].task_level,p);

}

static void EDFSTAR_public_activate(LEVEL l, PID p, struct timespec *o)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  struct timespec t;

  #ifdef EDFSTAR_DEBUG

    edfstar_printf("(E:act:%d)",p);

  #endif

  /* Test if we are trying to activate a non sleeping task    */

  /* save activation (only if needed... */

  if (proc_table[p].status != SLEEP) {

    /* a periodic task cannot be activated when it is already active */

    /* but aperiodic task can be reactivate before */

    if (lev->flag[p] & EDFSTAR_FLAG_SPORADIC) {

        if (proc_table[p].status != EDFSTAR_IDLE) {

          lev->nact[p]++;

          return;

        }

    } else {

        kern_raise(XACTIVATION,p);

    }

  }

  kern_gettime(&t);

  EDFSTAR_internal_activate(lev,p, &t);

  /* Set the deadline timer */

  lev->deadline_timer[p] = kern_event_post(&lev->deadline_timespec[p],

                                           EDFSTAR_timer_deadline,

                                           (void *)p);

}

static void EDFSTAR_public_unblock(LEVEL l, PID p)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  #ifdef EDFSTAR_DEBUG

    edfstar_printf("(E:ins)");

  #endif

  /* Insert task in the correct position */

  proc_table[p].status = EDFSTAR_READY;

  iq_timespec_insert(p,&lev->ready);

  /* and check for preemption! */

  EDFSTAR_check_preemption(lev);

}

static void EDFSTAR_public_block(LEVEL l, PID p)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  #ifdef EDFSTAR_DEBUG

   edfstar_printf("(E:ext)");

  #endif

  /* the task is blocked on a synchronization primitive. we have to

     remove it from the master module -and- from the local queue! */

  iq_extract(p,&lev->ready);

  /* and finally, a preemption check! (it will also call guest_end) */

  EDFSTAR_check_preemption(lev);

}

static int EDFSTAR_public_message(LEVEL l, PID p, void *m)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  struct timespec temp;

  #ifdef EDFSTAR_DEBUG

    edfstar_printf("(E:ecy ");

  #endif

  switch ((long)(m)) {

    /* Task EndCycle */

    case (long)(NULL):

       /* we call guest_end directly here because the same task may

         be reinserted in the queue before calling the preemption check! */

       level_table[ lev->scheduling_level ]->

         private_extract(lev->scheduling_level,p);

       lev->activated = NIL;

       iq_extract(p,&lev->ready);

       /* we reset the capacity counters... */

       proc_table[p].avail_time = proc_table[p].wcet;

       if (lev->nact[p] > 0) {

         #ifdef EDFSTAR_DEBUG

           edfstar_printf2("E%d",p);

         #endif

         /* Pending activation: reactivate the thread!!! */

         lev->nact[p]--;

         /* see also EDFSTAR_timer_deadline */

         kern_gettime(&temp);

         EDFSTAR_internal_activate(lev,p, &temp);

         /* check if the deadline has already expired */

         temp = *iq_query_timespec(p, &lev->ready);

         if (TIMESPEC_A_LT_B(&temp, &schedule_time)) {

           /* count the deadline miss */

           lev->dline_miss[p]++;

           kern_event_delete(lev->deadline_timer[p]);

           lev->deadline_timer[p] = NIL;

         }

       } else {

         #ifdef EDFSTAR_DEBUG

           edfstar_printf("e%d",p);

         #endif

         /* the task has terminated his job before it consume the wcet. All OK! */

         if (lev->flag[p] & EDFSTAR_FLAG_SPORADIC)

                proc_table[p].status = SLEEP;

         else

                proc_table[p].status = EDFSTAR_IDLE;

         if (lev->flag[p] & EDFSTAR_FLAG_SPORADIC && lev->deadline_timer[p] != NIL) {

           kern_event_delete(lev->deadline_timer[p]);

           lev->deadline_timer[p] = NIL;

         }

         /* and finally, a preemption check! */

         EDFSTAR_check_preemption(lev);

         /* when the deadline timer fire, it recognize the situation and set

           correctly all the stuffs (like reactivation, etc... ) */

       }

    #ifdef EDFSTAR_DEBUG

      edfstar_printf(")");

    #endif

    TRACER_LOGEVENT(FTrace_EVT_task_end_cycle,proc_table[p].context,proc_table[p].task_level);

    jet_update_endcycle(); /* Update the Jet data... */

    break;

  default:

    break;

  }

  return 0;

}

static void EDFSTAR_public_end(LEVEL l, PID p)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  #ifdef EDFSTAR_DEBUG

    edfstar_printf("(E:end)");

  #endif

  iq_extract(p,&lev->ready);

  /* we finally put the task in the ready queue */

  proc_table[p].status = FREE;

  iq_insertfirst(p,&freedesc);

  lev->activated=NIL;

  if (lev->deadline_timer[p] != -1) {

    kern_event_delete(lev->deadline_timer[p]);

    lev->deadline_timer[p] = NIL;

  }

  /* and finally, a preemption check! (it will also call guest_end) */

  EDFSTAR_check_preemption(lev);

}

/* Guest Functions

   These functions manages a JOB_TASK_MODEL, that is used to put

   a guest task in the EDFSTAR ready queue. */

static void EDFSTAR_private_insert(LEVEL l, PID p, TASK_MODEL *m)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  JOB_TASK_MODEL *job;

  if (m->pclass != JOB_PCLASS || (m->level != 0 && m->level != l) ) {

    kern_raise(XINVALID_TASK, p);

    return;

  }

  job = (JOB_TASK_MODEL *)m;

  /* if the EDFSTAR_guest_create is called, then the pclass must be a

     valid pclass. */

  *iq_query_timespec(p, &lev->ready) = job->deadline;

  lev->deadline_timer[p] = -1;

  lev->dline_miss[p]     = 0;

  lev->wcet_miss[p]      = 0;

  lev->nact[p]           = 0;

  if (job->noraiseexc)

    lev->flag[p] |= EDFSTAR_FLAG_NORAISEEXC;

  else {

    lev->flag[p] &= ~EDFSTAR_FLAG_NORAISEEXC;

    lev->deadline_timer[p] = kern_event_post(iq_query_timespec(p, &lev->ready),

                                             EDFSTAR_timer_guest_deadline,

                                             (void *)p);

  }

  lev->period[p] = job->period;

  /* Insert task in the correct position */

  iq_timespec_insert(p,&lev->ready);

  proc_table[p].status = EDFSTAR_READY;

  /* check for preemption */

  EDFSTAR_check_preemption(lev);

  /* there is no bandwidth guarantee at this level, it is performed

     by the level that inserts guest tasks... */

}

static void EDFSTAR_private_dispatch(LEVEL l, PID p, int nostop)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  level_table[ lev->scheduling_level ]->

    private_dispatch(lev->scheduling_level,p,nostop);

}

static void EDFSTAR_private_epilogue(LEVEL l, PID p)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  /* the task has been preempted. it returns into the ready queue... */

  level_table[ lev->scheduling_level ]->

    private_epilogue(lev->scheduling_level,p);

  proc_table[p].status = EDFSTAR_READY;

}

static void EDFSTAR_private_extract(LEVEL l, PID p)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

#ifdef EDFSTAR_DEBUG

  //kern_printf("EDFSTAR_guest_end: dline timer %d\n",lev->deadline_timer[p]);

#endif

  iq_extract(p, &lev->ready);

  /* we remove the deadline timer, because the slice is finished */

  if (lev->deadline_timer[p] != NIL) {

#ifdef EDFSTAR_DEBUG

//    kern_printf("EDFSTAR_guest_end: dline timer %d\n",lev->deadline_timer[p]);

#endif

    kern_event_delete(lev->deadline_timer[p]);

    lev->deadline_timer[p] = NIL;

  }

  /* and finally, a preemption check! (it will also call guest_end() */

  EDFSTAR_check_preemption(lev);

}

/* Registration functions */

/* Registration function:

    int flags                 the init flags ... see EDFSTAR.h */

LEVEL EDFSTAR_register_level(int master)

{

  LEVEL l;            /* the level that we register */

  EDFSTAR_level_des *lev;  /* for readableness only */

  PID i;              /* a counter */

#ifdef EDFSTAR_DEBUG

  printk("EDFSTAR_register_level\n");

#endif

  /* request an entry in the level_table */

  l = level_alloc_descriptor(sizeof(EDFSTAR_level_des));

  lev = (EDFSTAR_level_des *)level_table[l];

  /* fill the standard descriptor */

  lev->l.private_insert   = EDFSTAR_private_insert;

  lev->l.private_extract  = EDFSTAR_private_extract;

  lev->l.private_dispatch = EDFSTAR_private_dispatch;

  lev->l.private_epilogue = EDFSTAR_private_epilogue;

  lev->l.public_guarantee = NULL;

  lev->l.public_eligible  = EDFSTAR_public_eligible;

  lev->l.public_create    = EDFSTAR_public_create;

  lev->l.public_end       = EDFSTAR_public_end;

  lev->l.public_dispatch  = EDFSTAR_public_dispatch;

  lev->l.public_epilogue  = EDFSTAR_public_epilogue;

  lev->l.public_activate  = EDFSTAR_public_activate;

  lev->l.public_unblock   = EDFSTAR_public_unblock;

  lev->l.public_block     = EDFSTAR_public_block;

  lev->l.public_message   = EDFSTAR_public_message;

  /* fill the EDFSTAR descriptor part */

  for(i=0; i<MAX_PROC; i++) {

    lev->period[i]         = 0;

    lev->deadline_timer[i] = -1;

    lev->flag[i]           = 0;

    lev->dline_miss[i]     = 0;

    lev->wcet_miss[i]      = 0;

    lev->nact[i]           = 0;

    lev->budget[i]         = NIL;

  }

  iq_init(&lev->ready, NULL, IQUEUE_NO_PRIORITY);

  lev->activated = NIL;

  lev->scheduling_level = master;

  lev->cap_lev = NIL;

  NULL_TIMESPEC(&lev->cap_lasttime);

  return l;

}

int EDFSTAR_get_dline_miss(PID p)

{

  LEVEL l = proc_table[p].task_level;

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  return lev->dline_miss[p];

}

int EDFSTAR_get_wcet_miss(PID p)

{

  LEVEL l = proc_table[p].task_level;

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  return lev->wcet_miss[p];

}

int EDFSTAR_get_nact(PID p)

{

  LEVEL l = proc_table[p].task_level;

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  return lev->nact[p];

}

int EDFSTAR_reset_dline_miss(PID p)

{

  LEVEL l = proc_table[p].task_level;

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  lev->dline_miss[p] = 0;

  return 0;

}

int EDFSTAR_reset_wcet_miss(PID p)

{

  LEVEL l = proc_table[p].task_level;

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  lev->wcet_miss[p] = 0;

  return 0;

}

int EDFSTAR_setbudget(LEVEL l, PID p, int budget)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  lev->budget[p] = budget;

  return 0;

}

int EDFSTAR_getbudget(LEVEL l, PID p)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  return lev->budget[p];

}

void EDFSTAR_set_nopreemtive_current(LEVEL l) {

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  lev->flag[lev->activated]|=EDFSTAR_FLAG_NOPREEMPT;

}

void EDFSTAR_unset_nopreemtive_current(LEVEL l) {

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  lev->flag[lev->activated]&=~EDFSTAR_FLAG_NOPREEMPT;

}

int EDFSTAR_budget_has_thread(LEVEL l, int budget)

{

  EDFSTAR_level_des *lev = (EDFSTAR_level_des *)(level_table[l]);

  int i;

  for(i = 0; i< MAX_PROC; i++)

    if (lev->budget[i] == budget) return 1;

  return 0;

}